source4/kdc/pac-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    PAC Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "../libds/common/flags.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "librpc/gen_ndr/ndr_krb5pac.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "auth/auth_sam.h"
  31 #include "auth/auth_sam_reply.h"
  32 #include "kdc/kdc.h"
  33 #include "param/param.h"
  34
  35 static
  36 NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
  37                                        struct auth_serversupplied_info *info,
  38                                        DATA_BLOB *pac_data)
  39 {
  40         struct netr_SamInfo3 *info3;
  41         union PAC_INFO pac_info;
  42         enum ndr_err_code ndr_err;
  43         NTSTATUS nt_status;
  44
  45         ZERO_STRUCT(pac_info);
  46
  47         nt_status = auth_convert_server_info_saminfo3(mem_ctx, info, &info3);
  48         if (!NT_STATUS_IS_OK(nt_status)) {
  49                 DEBUG(1, ("Getting Samba info failed: %s\n",
  50                           nt_errstr(nt_status)));
  51                 return nt_status;
  52         }
  53
  54         pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  55         if (!mem_ctx) {
  56                 return NT_STATUS_NO_MEMORY;
  57         }
  58
  59         pac_info.logon_info.info->info3 = *info3;
  60
  61         ndr_err = ndr_push_union_blob(pac_data, mem_ctx, &pac_info,
  62                                       PAC_TYPE_LOGON_INFO,
  63                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  64         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  65                 nt_status = ndr_map_error2ntstatus(ndr_err);
  66                 DEBUG(1, ("PAC (presig) push failed: %s\n",
  67                           nt_errstr(nt_status)));
  68                 return nt_status;
  69         }
  70
  71         return NT_STATUS_OK;
  72 }
  73
  74 krb5_error_code samba_make_krb5_pac(krb5_context context,
  75                                     DATA_BLOB *pac_blob,
  76                                     krb5_pac *pac)
  77 {
  78         krb5_data pac_data;
  79         krb5_error_code ret;
  80
  81         /* The user account may be set not to want the PAC */
  82         if (!pac_blob) {
  83                 return 0;
  84         }
  85
  86         ret = krb5_data_copy(&pac_data, pac_blob->data, pac_blob->length);
  87         if (ret != 0) {
  88                 return ret;
  89         }
  90
  91         ret = krb5_pac_init(context, pac);
  92         if (ret != 0) {
  93                 krb5_data_free(&pac_data);
  94                 return ret;
  95         }
  96
  97         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
  98         krb5_data_free(&pac_data);
  99         if (ret != 0) {
 100                 return ret;
 101         }
 102
 103         return ret;
 104 }
 105
 106 bool samba_princ_needs_pac(struct hdb_entry_ex *princ)
 107 {
 108
 109         struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
 110         unsigned int userAccountControl;
 111
 112
 113         /* The service account may be set not to want the PAC */
 114         userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
 115         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 116                 return false;
 117         }
 118
 119         return true;
 120 }
 121
 122 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 123                                 struct hdb_entry_ex *client,
 124                                 DATA_BLOB **_pac_blob)
 125 {
 126         struct samba_kdc_entry *p = talloc_get_type(client->ctx, struct samba_kdc_entry);
 127         struct auth_serversupplied_info *server_info;
 128         DATA_BLOB *pac_blob;
 129         NTSTATUS nt_status;
 130
 131         /* The user account may be set not to want the PAC */
 132         if ( ! samba_princ_needs_pac(client)) {
 133                 *_pac_blob = NULL;
 134                 return NT_STATUS_OK;
 135         }
 136
 137         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
 138         if (!pac_blob) {
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141
 142         nt_status = authsam_make_server_info(mem_ctx, p->kdc_db_ctx->samdb,
 143                                              lp_netbios_name(p->kdc_db_ctx->lp_ctx),
 144                                              lp_sam_name(p->kdc_db_ctx->lp_ctx),
 145                                              p->realm_dn,
 146                                              p->msg,
 147                                              data_blob(NULL, 0),
 148                                              data_blob(NULL, 0),
 149                                              &server_info);
 150         if (!NT_STATUS_IS_OK(nt_status)) {
 151                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 152                           nt_errstr(nt_status)));
 153                 return nt_status;
 154         }
 155
 156         nt_status = samba_get_logon_info_pac_blob(mem_ctx, server_info, pac_blob);
 157         if (!NT_STATUS_IS_OK(nt_status)) {
 158                 DEBUG(0, ("Building PAC failed: %s\n",
 159                           nt_errstr(nt_status)));
 160                 return nt_status;
 161         }
 162
 163         *_pac_blob = pac_blob;
 164         return NT_STATUS_OK;
 165 }
 166
 167 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 168                                    krb5_context context,
 169                                    krb5_pac *pac, DATA_BLOB *pac_blob)
 170 {
 171         struct auth_serversupplied_info *server_info;
 172         krb5_error_code ret;
 173         NTSTATUS nt_status;
 174
 175         ret = kerberos_pac_to_server_info(mem_ctx, *pac,
 176                                           context, &server_info);
 177         if (ret) {
 178                 return NT_STATUS_UNSUCCESSFUL;
 179         }
 180
 181         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 182                                                   server_info, pac_blob);
 183
 184         return nt_status;
 185 }
 186
 187 /* this function allocates 'data' using malloc.
 188  * The caller is responsible for freeing it */
 189 void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
 190 {
 191         PA_DATA pa;
 192         unsigned char *buf;
 193         size_t len;
 194         krb5_error_code ret = 0;
 195
 196         if (!e_data)
 197                 return;
 198
 199         pa.padata_type          = KRB5_PADATA_PW_SALT;
 200         pa.padata_value.length  = 12;
 201         pa.padata_value.data    = malloc(pa.padata_value.length);
 202         if (!pa.padata_value.data) {
 203                 e_data->length = 0;
 204                 e_data->data = NULL;
 205                 return;
 206         }
 207
 208         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 209         SIVAL(pa.padata_value.data, 4, 0);
 210         SIVAL(pa.padata_value.data, 8, 1);
 211
 212         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 213         free(pa.padata_value.data);
 214
 215         e_data->data   = buf;
 216         e_data->length = len;
 217
 218         return;
 219 }
 220
 221 /* function to map policy errors */
 222 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 223 {
 224         krb5_error_code ret;
 225
 226         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 227                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 228         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 229                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 230         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 231                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 232         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 233                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 234         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 235                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 236         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 237                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 238         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 239                 ret = KRB5KDC_ERR_POLICY;
 240         else
 241                 ret = KRB5KDC_ERR_POLICY;
 242
 243         return ret;
 244 }
 245
 246 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 247  * for consistency */
 248 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 249                                        const char *client_name,
 250                                        const char *workstation,
 251                                        bool password_change)
 252 {
 253         TALLOC_CTX *tmp_ctx;
 254         NTSTATUS nt_status;
 255
 256         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 257         if (!tmp_ctx) {
 258                 return NT_STATUS_NO_MEMORY;
 259         }
 260
 261         /* we allow all kinds of trusts here */
 262         nt_status = authsam_account_ok(tmp_ctx,
 263                                        kdc_entry->kdc_db_ctx->samdb,
 264                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 265                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 266                                        kdc_entry->realm_dn, kdc_entry->msg,
 267                                        workstation, client_name,
 268                                        true, password_change);
 269
 270         talloc_free(tmp_ctx);
 271         return nt_status;
 272 }
 273